Probably cuz your using Windows 10 OS?
No, really just download the Wallet and Blockchain, the Namecoin Blockchain is only 6 GB currently...........
Bitcoin Blockchain size is something like 300 GB or more IDK
Or you just wanting Electrum for the 13 Word Backup?
The wallet I downloaded is for windows and tried the 3 types for windows OS standalone/portable/installer so not sure why windows 10 would be the issue.
I don't want whole blockchain but only lite wallet to keep the coins I bought off the exchange.The older 3.3.10 wallet I first sent the coins to worked initially before but no longer works now because it won't connect either so not sure what the problem is.